Percentage Decrease from 100 to 80
The percentage change from 100 to 80 is −20%.
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Currency mode
Percentage change from X to Y
→
100 → 80
−20%
Decrease of 20 · Formula: (80 − 100) ÷ 100 × 100
Before vs. After
Original100
New value80
▼ −20% decrease
Other changes from 100
| New Value | % Change |
|---|---|
| 150 | +50% |
| 125 | +25% |
| 120 | +20% |
| 110 | +10% |
| 90 | −10% |
| 80 ← | −20% |
| 75 | −25% |
| 50 | −50% |
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How to Calculate the Percentage Change
Percentage change tells you how much a value has gone up or down relative to its original amount.
1
Formula: % Change = (New − Old) ÷ |Old| × 100
2
Difference: 80 − 100 = -20
3
Divide: -20 ÷ 100 = -0.2
4
Multiply by 100: = −20%
(80 − 100) ÷ 100 × 100 = −20%
The value decreased by 20 — a −20% decrease.
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